How do I fix this

Hey I have a 1994 Cavalier and my gas gauge likes to move around a lot.
I will be driving and the needle will stay steady but when I brake the needle will go down, and when i accelerate from a stop the needle will go way up. How do I fix this?
Thanks

its natural... when you brake the gas moves around in the tank and affects the position of the sensor... i usually get this to start happening around 1/2 tank...when i floor it... i watch the needle drop to less gas

so when im at 1/4 tank, and i stop it moves down to empty.. it moves toooo much

You shouldn't really let them get that low.... and yes mine does that aswell... if you let them run of gas and stall.... a fun time will start